Serpentine Swap Questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rebel01 · 07-31-2010, 08:49 PM

Hey guys, I was able to answer almost all of my questions reading old posts, but I'm left with 3 unanswered.

My truck is a 71 with the original 350. The serpentine setup I have is off of a 4.3 & is the aluminum bracket version.

Question 1) What upper & lower radiator hoses do I need?

Question 2) Will I need to swap thermostat housings?

Question 3) Do I need to run a later model harmonic balancer with this setup?

Thanks for any help, so far this board has been a great resource for me!

Alex Hayley · 07-31-2010, 08:59 PM

1) I took the easy way out and used something like this: http://www.summitracing.com/parts/MRG-11010C/ . I thought it would look cheap but I kind of like it.

2) Not necessarily. See if you can find a rad hose that fits the existing thermostat housing.

3) No. As long as the crank pulley bolts to existing harmonic damper and lines up correctly with the other pulleys you are fine.

dwcsr · 07-31-2010, 09:32 PM

I made up a hose for mine from the truck I got it from and the original using a step down exhaust pipe. I used the stat housing for the truck I got it off of, a 91 and I used the original balancer.

Sammy · 07-31-2010, 11:00 PM

Thermo housing from the doner a serp setup and the hose. If you didn't grab it you can get a 45 swivel thermo with the O ring. And a upper hose from a parts store that fits a 93 or 94 3/4 T P/U GMC will work and probally others too but I know that year n truck will work. The lower hose is more of a crap shoot depending on where your engine is mounted.

rebel01 · 07-31-2010, 11:24 PM

Sweet! Thanks for all the info folks. I still have the donor motor in the back of the truck, so I'll grab the t-stat housing off it.

@ Sammy - the engine is in the front location, from what I can tell, if that'll help narrow it down on the lower hose.

vasquezmrysvll · 08-01-2010, 12:10 AM

lower hose is gonna be from a 84 Chevy burd with 454. just did it myself!

cdowns · 08-01-2010, 04:59 AM

make sure you get the reverse rotation waterpump that is needed

btullis99 · 08-01-2010, 05:11 AM

Quote:

Originally Posted by cdowns

make sure you get the reverse rotation waterpump that is needed

x2, very important

rebel01 · 08-01-2010, 09:30 AM

Quote:

Originally Posted by vasquezmrysvll

lower hose is gonna be from a 84 Chevy burd with 454. just did it myself!

Thanks!

Quote:

Originally Posted by cdowns

make sure you get the reverse rotation waterpump that is needed

Quote:

Originally Posted by btullis99

x2, very important

Absolutely. The one on the donor looked like it was replaced recently, so I pirated it as well.

07-31-2010, 08:49 PM	#1
rebel01 Registered User Join Date: Mar 2010 Location: Lorena, Tx Posts: 11	Serpentine Swap Questions Hey guys, I was able to answer almost all of my questions reading old posts, but I'm left with 3 unanswered. My truck is a 71 with the original 350. The serpentine setup I have is off of a 4.3 & is the aluminum bracket version. Question 1) What upper & lower radiator hoses do I need? Question 2) Will I need to swap thermostat housings? Question 3) Do I need to run a later model harmonic balancer with this setup? Thanks for any help, so far this board has been a great resource for me! __________________ Thanks, Jonathan 71 C10 Cheyenne 350/350 LWB Vices= cold beer, fast Mustangs, & old Chevy Trucks

07-31-2010, 08:59 PM	#2
Alex Hayley Registered User Join Date: Jul 2000 Location: NC Posts: 987	Re: Serpentine Swap Questions 1) I took the easy way out and used something like this: http://www.summitracing.com/parts/MRG-11010C/ . I thought it would look cheap but I kind of like it. 2) Not necessarily. See if you can find a rad hose that fits the existing thermostat housing. 3) No. As long as the crank pulley bolts to existing harmonic damper and lines up correctly with the other pulleys you are fine.

07-31-2010, 09:32 PM	#3
dwcsr Hollister Road Co. Join Date: Apr 2005 Location: Houston Posts: 6,131	Re: Serpentine Swap Questions I made up a hose for mine from the truck I got it from and the original using a step down exhaust pipe. I used the stat housing for the truck I got it off of, a 91 and I used the original balancer. Last edited by dwcsr; 07-31-2010 at 09:33 PM.

07-31-2010, 11:00 PM	#4
Sammy Registered User Join Date: Apr 2000 Location: Bonne Terre, Mo Posts: 3,005	Re: Serpentine Swap Questions Thermo housing from the doner a serp setup and the hose. If you didn't grab it you can get a 45 swivel thermo with the O ring. And a upper hose from a parts store that fits a 93 or 94 3/4 T P/U GMC will work and probally others too but I know that year n truck will work. The lower hose is more of a crap shoot depending on where your engine is mounted. __________________ '69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"

07-31-2010, 11:24 PM	#5
rebel01 Registered User Join Date: Mar 2010 Location: Lorena, Tx Posts: 11	Re: Serpentine Swap Questions Sweet! Thanks for all the info folks. I still have the donor motor in the back of the truck, so I'll grab the t-stat housing off it. @ Sammy - the engine is in the front location, from what I can tell, if that'll help narrow it down on the lower hose. __________________ Thanks, Jonathan 71 C10 Cheyenne 350/350 LWB Vices= cold beer, fast Mustangs, & old Chevy Trucks

08-01-2010, 12:10 AM	#6
vasquezmrysvll "the other guy" Join Date: Oct 2008 Location: Olivehurst California 95961 Posts: 901	Re: Serpentine Swap Questions lower hose is gonna be from a 84 Chevy burd with 454. just did it myself! __________________ God Said,"Building A 10 Second Import Is Like Coming Out Of The Closet, In The End Ur Still....."EXPLETIVE"

08-01-2010, 04:59 AM	#7
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Serpentine Swap Questions make sure you get the reverse rotation waterpump that is needed __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

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